Sheet-metal hollow-ware drawing-press.



PATENTED OCT. 16, 1906.

P. R. HAHNBMANN. I

SHEET METAL HOLLOW WARE DRAWING PRESS.

APPLICATION 1 11.51) FEB-19. 1906.

3 SHEETS-SHEET l,

No. 833,716. PATENTEDOCT. 16, 1906.

I P. R. HAHNEMANN. SHEET METAL HOLLOW WARE DRAWING PRESS.

APPLICATION FILED FEB-19, 1906.

3 SHEETS-SHEET 2.

I 4 T t 40 j 55 g5 Q h 3 Tl". H C /5 s I w i Ah 0 l x F l Q z W a H M 16 @1- 39?! i g I i :t:: l I \I L E 40 545% .J V I; g I H i I ll 1 M I v i M 1 l 43 18 W] E75. 5 T in I 33 3 Wu m I 37 I I 37 h .0 I 38 I 32 E'IH/ I I i i L l 5 I r l -nw=- 5 v DIE/1125525.- 43 [min/hr:

@412 ,Q, Mamm TATENTED OCT. 16, 1906.

P.- R. HAHNBMANN. SHEET METAL HOLLOW WARE DRAWING PRESS.-

APPLICATION FILED PBB.19, 1906.

3 SHEETS-SHEET 3.

UNITED sTArEs PATENT orrron.

PAUL R. HAHNEMANN, OF NEWARK, NEW JERSEY, ASSIGNOR OF ONE- HALF TO EDMUND W. ZEH, OF NEWARK, 'NEW JERSEY.

SHEET-METAL HoLLow-wARE pnAwme-Pnzsa Specification or Letters Patent.

Patented 0ct..16, 1906.

Application filed I' -ri 19, 1906. Serial No. 801.777.

To all whom it m my concern:

Be it known that 1, PAUL R. HAHNEMANN, a subject of the German Emperon'and a resident of Newark, in the county of Essex and State of New Jersey, have invented a new and useful Sheet-Metal Hollow-Ware Draw ing Press, of which the following is a Specification.

My invention relates to a sheet-metal hollow-ware drawing-press, with the object in view of roviding simple and effective means for holc ing the sheet securely clamped and for operating the plunger while the sheet is so clamped.

-A practical embodiment of my invention is represented in the accompanying drawings, in which- Figure 1 is a view of the press in side elevation. Fig. 2 is a transverse vertical central section of ,the same. Fig. 3 is a horizontal section in the plane of the line A A of Fig. 2. Fig. 4 is a horizontal section in the plane of the line B B of Fig. 2, and Figs. 5, 6, and 7 are diagrammatical views for illustrating the action of the respective cams on the arms which control the toggle-levers and the eccentrio which controls the plunger.

The press-frame may conveniently com rise a pedestal portioir'l, on which the holow die 2 is supported. Uprights; 3 and '4 extend upwardly from the edestati at 0, pb-' site ends thereon for supporting the wor 'ng' parts of the press, the said uprights being connected at, the top byan arched bar 5. The plungerpperating shaft 6 isv mounted in suitable bearings in the uprights 3 and 4 and is provided intermediate of the uprights with a crank portion: 7, to which the pitman S is connected at its upper end, the opposite end of the pit-man being connected to the up er end of a slide 9, (see Fig. 2,) the lower end of said slide being connected to the lunger 10.

The slide 9 (see Fig. 4) is PIOVl( ed with tapered ways 11 and 12, whlch slide, respectively, in grooves 13 14, formed in the opposite walls of a guide-block 15, set between the uprights 3 and 4 and itself constructed to slide up and down in ways 16 17, on the inner faces of the uprights. To the lower end of the guide-bloc the clamping-j aw 18 is secured, the lower end of said clamping-j aw 18 being arranged to coact with the upper end of'the die-block 2 to hold a sheet 19 firmly between them while acted upon by the plun- (Not shown.)

ger passing downwardly through the clam 1l1g+]8.W 18 into contact with the sheet. T e upper end of the slide 9 is provided with a rounded socket 20 for receiving the lower end of the pitman, and the latter is held therein by means of a cross-pin 21. The itman is convenientl made in two parts, ma e and fe male, .in or er to adjust its length, the male part (denoted by 22) being screw-threaded mto the female part 8 and held in displacement by means of a set-screw 23. on the opposite ends of the shaft 6, exterior to the uprights 3 and 4, I mount spur-wheels 24 25 and impart motion to these from a drive-- shaft 26, mounted at one side of the frame and driven from a suitable source of power. This drive-shaft 26 I provide with drive-pinions 27 28, the former for engaging the Wheel 24 and the latter for engaging the wheel 25. While it is'obvious that one of these pinions would drive bothwheels 24 25, secured to the common shaft 6, I prefer for the purpose of distributing strain to apply power to both simultaneously by means of the pinions in engagement with each. These spur-wheels 24 25 are, in effect, master-wheels, and while they serve to impart a rotary motion to the shaft 6 for operating the plunger to draw the metal they also control the clamping of the sheet to securely hold it while itis being operated upon by the plunger, and it is to this feature of the inven- -tion that particular attention is called.

Two rockshafts (denoted, respectively, by 29 and 30) are mounted in extended parts of the uprights 3 and 4 near their upper ends, and each is provided with a pair of arms, the members of the arms on the rock-shaft 29 being denoted by 31 32 and those on the shaft 30 by 33 34. These arms are bifurcated and have pivoted between them the upper ends of links for operating the clamp 18.

The links co'nnectedwith the arms 31 32 are denoted by 3'6 and those connected with the arms 33 34 by' 37 38. The links 35 36 are connected at their lower ends with one side of a skeleton frame 39, and the links 37 ICC mg block 15, which carries the clamping-jaw I and the same shaft is tr'it thereto, the groove being of sufficient size shszi ts 29 The 4 of ninety degrees, and extends downwardly its netraeted elicit 30 has see,

18. Each arm 31 32 33 34 and its respective link 35 36 37 38 form a toggle-lever, two of which are operated by the ro'elcshcft 29 and two by the rock-shaft 30, for moving the clamping-jaw 18 into clamping relation with respect to the die 2 and lifting it sway from the some to relesscthe work.

The shsfts29 30 are rocked by cams on the faces of the master-wheels 24 25, and for convenience in describing the construction and operation of this shaft-actuating mechanism the ends of the shafts 29 and 30 toward the master-wheel 24: will be considered right and the ends toward the mastm-wheel 25 left. fihc ri lst end git the shaft 29 is provided with T; 4(1, which when the clempingj aw 18 is in its retracting position, as shown in Fig. 2, occupies a sulgstenticliy upright position, and the. some shaft is provided on its left end with c 42, which occupies a. position radially at an angle to the shcft 41, preferably an angle of about ninety degrees. The rockshsft' 30 is provided on its right end with a crank &3, which under the same condition of the clamping-jaw 18 as stated above occupies a position substantially horizontal, provided on its left end with a. crank -14, which occupies e osition at en angle to the crank 43, preferab y an angle from the shaft when the clamping-jaw is in the position shown. The master-wheel 24 is provided on its face with e e'amgroo-ve con .of a portion i= ccnccntric with the oi the wheel and with portion 46 eccenas receive rollers on the wrist-pins of the cranks 41 end 43 on the right ends of the master-wheel is pro; vidcd on its face with a cam-groove consisting of a concentric portion 47 and an. eccentric portion cs, the shape of this groove being shown in dotted lines, s, 5 and 6, and its position in Fig. .3, where t amifriction-roli. crs Jon the wrxstspincf the crank 44 one just leeviagtlie endof the concentric portion d7 of theeaid groove. This groove, composed ofthe parts 47 and 4:8, is intended to receive sntitfriction roiiers on the wrist-pins of the tracks 42 i in operation, assuming the plunger to he position and the plate-holding aw als roascd from theplate, as shown. in Figs 3 end of the drawings, it now the, piste he put in position on the .dieaed the sets set nroperation the master wheels will e rotated in the direction indicated by the arrow. (gee 5.) The crank {3011 the rock just entered theeccentric portion 46 of the cam-groove on the resistorwheel 24, end the crenkcl on the rook-'shel'tt 29 is iust escaping immthe concentric-porsenor the'scme groove; At;this 'same mementg theerenkm on the rockchafvt 29 ishem "the eccentric portion of thecem on the shafts"29 and in is lifted there will its position, following the re master-wheel 25, as clearly indicated in dotted lines, Fig. 5, while the crank 44 on the rcckrshaft is just escaping from the concentric portion of the cam on the said masterwheel 25. As these master-wheels continue to revolve in the same direction the crank will be forced downwardly by the eccentric portion of the cam on the master-wheel'24 mto the position shown in Fig. 6, straightening the toggle-levers connected with the rock-shaft 30,. and at the same time the crank 42 will be forced upwardly by the cam on the master-wheel 25 into the position shovm in Fig. 6, rocking the shaft 29 in the direction to straighten the toggle-levers connected with it, thus forcing the clampingjaw ls'downwsrdly into clamping position on the late 19. The swinging of the crank 43 on ta right end of the rock-shaft 30 and the swinging of the crank 42 on the left end of the rock-shaft 29 will at the same time swing the crank 44 on the left end of the rockshaft 30 into the position shown in dottedlines, Fig. 6, and the crank 41 on the right end of the rock-shaft 29 into the position shown in heavy lines, Fig. 6. The rockshalts 29 30 will be held in this position. while the respective cranks engaged with the cem-grooves on the master-wheels are traversing the concentric portion of the said groovesin the present instance about it quarter-revolution. As soon as this delay has taken place the cam-groovc en the master- Wheel 24 will have reached a position where its eccentric portion will engage the crank 41 on the right end of the rock-shaft 29, while the cam-groove on the master-wheel 25 will have reached a position such that its eccentric ortion will at the same time engage the cran 44 on the left end of the rock-shaft '30, and the further rcvolu-ticn oi the masterwheels will simultaneously rock the rockthe reverse direction, throwing the parts again into the position shown in diagram Fig. 5, with the clampingjaw lifted from the be a dwell while the ore-mks ere traversing the concentric portions of the respective grooves, during which time the blank which has been operated upon may be removed and another plate laced in position. The relation between t e action of the clamping-jaw 18 and the action of the plunger 10 is such that the lunger will begin to act immediatelyiafter t e clamping-jaw has been thrown inti): clamping relation on the plate and will continue to act durin the interval while the late is held hjaw 18 and wilfthcn gradually recede case and tipwsrd movement of the clamping-jaw. These relative movements of the clamping-jaw'and drawing-plunger are represented in Fig. 7, the heavier line 49 indicating the motion of the clamping-jaw, While the lighter line 50 plate, and after this flew the c emping- I indicates the motion of the will be observed reaches its lowermost plunger. It that the clamping-jaw first ositionviz.' the position where it clamps't e plateandthatit is closely followed by theplunger, which continues on down. to the depth to which the i plate is to be drawn, while the clamping-jaw upward motion of the 'tracte 'ger reaches its retracted occupies the constant osition shown by the horizontal portion of t 1e line 49 and that the clamping-jaw then lace quite rapidly, reaching its recl position some time before the plunposition, thereb giving opportunity tomanipulate the plate, which may be lifted, together with the plunger. The structure provides for o crating simultaneously upon the right en of one rock-shaft and left end of another to advance the clamping-jaw and then in turn operate u onthe left end of one shaft and right end 0 the other to retract the clamping-jaw, a cam acting alternately upon one shaft and takes port for holding a sheet of metal to be operated upon and aplunger arranged to operate upon the metal, of a clamping-jaw for holding the metal in position wh1 le being operated upon toggle-levers for advancing and retracting the jaw, rock-shafts for operating the toggle-levers, cranks on the opposite ends of each shaft and cams located at the opposite ends of the shafts, each cam bein arranged to operate alternately on the cranIis of the different shafts at the end where it is located.

4. The combination with suitable means for'supporting and operating on a sheet of metal, of a clamping-j aw for holding the metal in position while being operated upon, rock-shafts connected with the clamping-j aw for lowering it and raising it and earns at the opposite endsof the rock-shafts, each of said cams being-arranged to alternately operate one rock-shaft in a direction to depress the jaw and the other rock-shaft in a direction'to then upon another at one end of each shaft and another cam alternately actingupon the shafts at their opposite ends.

It is obvious that changes might be resorted to in the form and arrangement-of the parts without departing from the spirit and scope of my invention. Hence I do not wish to limit myself strictly to thestructure herein shown and described; but

What I claim is i 1. A drawing-press comprising suitable means for drawing the metal and means for holding the plate to be drawn, said holding means comprising toggle-levers, shafts for operating the toggle-levers and cams at the opposite ends of the shafts for alternately acting upon the different shafts to control their movements.

2. The combination with a suitable support for a sheet of metal and a plunger arranged to operate on the sheet, of a clamping-jaw for holding the metal in position while it is bein g operated upon, toggle-levers for advancing and retracting the jaw, rockshafts for operating the toggle-levers, master-Wheels at the opposite ends of the shafts, each wheel being provided with a cam arranged to alternately aetupon the different shafts and means for operating the masterwhechsi l The combination with a suitable sup 1 toggle-levers to the lift the jaw.

5. The combination with suitable means for supporting a sheet of metal in position to beoperated upon and means for operating on the metal, of a clam ing-jaw for holding the metal in osition W ile it is being operated upon, roe shafts connected with the clamping-jaw for lowering it and raising it and cams at the opposite ends of the rock-shafts to simultaneously rock the shafts in opposite directions. I

6. The combination with suitable means for supporting a sheet of metal in position to e operated upon and means for operating on the sheet of metal, of a clamping-jaw movable toward and away from the sheet of metal, toggle-levers for operating the jaw, rockshafts for operating the toggle-levers, cams at the opposite ends of the shafts for operating the shafts and means for securing the clamping-j aw in vertical adjustment.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 13th day of February, 1906..

PAUL R. HAHNEMANNr Witnesses: I

FREDK. HAYNES, HENRY THIEME. 

